Troubleshooting Guide For Lockout Conditions - Econar GeoSource Vara GV Series Installation And Operating Instructions Manual

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xII.
TROUBLESHOOTING GUIDE FOR LOCKOUT CONDITIONS
If
the heat
pump
goes
into lockout
on
a
high or low
pressure switch,
the cause
of
the
lockout
can be
narrowed down by
knowing
the
operating mode
and which pressure switch
the
unit
locked out
on.
The
following
table
will
help track down
the
problem
once this
information
is
known.
Note:
A
lockout condition
is
a
result of
the heat
pump shutting
itself
off
to protect
itself,
never
bypass the
lockout circuit.
Serious damage can be caused
by the system operating without lockout protection.
X[I.
TROUBLESHOOTING GUIDE FOR UNIT OPERATION
Evaporator
(air coil)
ices
over
in
High
Pressure
(Condenser,
Air Coil
Side)
-Loss/lack of airflow
-High
return air temperatures (above
85oF)
-Dirty (fouled)
condenser
coil
-Overcharged refri gerant circuit
Heating
Low
Pressure
@vaporator, Earth Coupled Water
Coil
Side)
-Loss/lack of
flow
through earth coupled
coil
-Low fluid
temperature operation in
the earth
loop
-Freezing fluid
in
heat
exchanger (lack of
antifreeze)
-Undercharged/overcharged refrigerant circuit
-Expansion valve/sensing bulb malfunction
High
Pressure
(Condenser, Earth Coupled Water Coil
Side)
-Loss/lack of water flow in
earth
loop
-High fluid
temperarure operation
in
the earth loop
-Dirry (fouled)
condenser
coil
-Overchargq4
refri gerant
circuit
Cooling
Low
Pressure
(Anti-Short Cycle)
(Evaporator, Air
Coil Side)
-Loss/lack of
airflow
-Low
air temperature (below
55T)
-Freezing condensation on air coil
-Undercharged/overcharged refrigerant circuit
-Expansior! valve/sensing
bulb malfunction
Blown Fuse/Tripped Circuit
Breaker
Replace fuse or
reset circuit breaker"
(Check
for
correct size fuse or
circuit
breaker.)
Blown
Fuse
on Controller Replace
fuse
on controller. (Check for
correct
size
fuse.)
Broken or Loose Wires Replace or tighten the wires
Voltage Supply Low
If
voltage is
below minimum
voltage on
data
plate, contact local power
company. Supply
below
196
volts
will
hamper compressor
startup.
Low Voltage Circuit
Check transformer
and fuse
for
burnout or voltage less than
1
8 volts.
Thermostat
Set thermostat on
"Cool"
and lowest temperature setting, wait for
timeout period
and
unit
should
run.
Set thermostat on
"Heat"
and highest temperature setting,
wait for
timeout
period
and
unit should
run. If
unit
does
not run
in
both
cases,
the
thermostat could
be
wired
incorrectly
or
be
faulty.
To prove faulty
or
miswired
thermostat, disconnect thermostat wires
at the unit
and
jumper
befween
"R",
"Y"
and
"G"
terminals
and
unit should
run.
Replace
thermostat with
correct heat
pump
themostat
only. A
substitute may
not work properly.
Entire
unit
does not run
Interruptible
Power
Check supply voltage.
Dirty
Filter
Check
filter.
Clean or replace
if
found dirty.
Thermostat Improperly
Set Is
it
below
room temperature? Clleck
the thermostat
setting.
Defective Thermostat
Check therrLostat
operation.
Replace
if
found defective.
lncorrect Wiring
Check for
broken, loose, or incorrect wires.
Unir
will
not
operate on
"heating"
Blower Motor Defective
Check
blower
motor
in
one
of
the
other switch
positions. ff
it
does
not
operate the
compressor
will
go
off
on
higlr
head.
Dirty
Air
Filter
Check
filter.
Clean or replace
iffound
dirty
Airflow
Lack of
adequate
airflow
or improper distribution of
air.
Check
the
motor
sizing.
Check the
filter,
it
should
be
inspected every month
and changed
if dirty.
Check
for
closed
registers.
Remove or
qdd resistance accordingly.
speed and
duct
Low Air
Temperature Room temperatures below
65oF
may ice over the evaporator
mode
13
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